Telegram is a shady app. They rolled their own crypto, put up a "challenge" to break it with conditions that would've made most crypto unbreakable; most importantly, they do not even encrypt anything by default

@Gargron They are all based on Double Ratchet Algorithm. But the big difference of Jabber (aka XMPP) to all the rest is its decentralization. I haven't yet given up on a decentralized messaging platform, although I know that it's very hard to do right.